Titlebook: Electron Correlation in New Materials and Nanosystems; Kurt Scharnberg,Sergei Kruchinin Conference proceedings 20071st edition Springer Sc

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Toshiki Iwasaki,Masahiro Sawadas voltage, ., on achieving of high current densities, 10. A/cm.. These features in . are observed when the electron flow is directed from the nonmagnetic metal into the ferromagnet and connected with magnetization excitations in the ferromagnet induced by the current. Applying an external magnetic f

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Stefan Wesner,Sabine Roller,Harald Klimachrst, we review the present situation of the superconductivity in MgB., which can be interpreted in terms of BCS-type phonon-mediated pairing. In particular, we focus on the relationship between the superconductivity and the electronic structure in MgB. and two gap feature. Second, we review our pres

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G. Geiser,H. Foysi,W. Schr?der,M. Meinkeantum condensates. This mechanism provides the Tc amplification in particular nanoscale material architectures like superlattices of metallic layers. The Feshbach resonance is reached by tuning the chemical potential to a Van Hove-Lifshitz singularity (vHs) in the electronic energy spectrum associat

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Michael Resch,Xin Wang,Sabine Rolleret al., 2001; Golubov et al., 2002; Choi et al., 2002; Dahm, 2005). The two significantly different gaps exist on disconnected parts of the Fermi surface: a small gap (~2 meV) on the π bands and a large gap (~7 meV) residing on the σ bands. This leads to a number of peculiar consequences both in its

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Xiaowei Xu,Jochen J?ger,Hans-Peter Kriegelexpressions for thermodynamic characteristics obtained. The dependence of superconducting gaps on Al doping are presented with the ⊿. crossing at . = 0.38. The calculated anisotropy coefficients for the MgB. critical magnetic fields agree with the experiment.

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,Change-Coaching für High Performer,orresponding to a nanosize two-gap superconductivity is presented, and the partition function of the nanosize system is analytically derived by using a path integral approach. A definition of the critical level spacing of the two-gap superconductivity is also presented, and we discuss condensation e

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https://doi.org/10.1007/978-94-011-0685-6d state are reviewed and discussed in the context of various theoretical frameworks. The increase observed in overdoped samples is compatible with a BCS condensation, while the decrease seen in underdoped samples is not. The significance of the sign reversal at or near optimum doping is given specia

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